REL Acoustics Serie S 12-Inch Powered Subwoofer in Piano Black Lacquer (Each) - S/850 BLACK

REL Acoustics S/850 BLACK Serie S 12-Inch Powered Subwoofer in Piano Black Lacquer (Each)

The REL Acoustics S/850 BLACK Serie S 12 in powered subwoofer combines 850 watts RMS of Linear Class D amplification with in-room low-frequency extension of -6 dB at 19 Hz. Its front-firing CarbonAlloy driver and down-firing 12 in passive radiator serve premium music and home-theater systems in recommended 300-700 sq. ft. rooms. Simultaneous High Level and .1/LFE operation supports both two-channel listening and movie soundtracks without giving up either signal path. Piano Black Lacquer and an included cloth grille complete this single-subwoofer configuration.

Key Features

850 Watts RMS With Transient Headroom

The built-in Linear Class D amplifier supplies the bass driver's operating power, rather than drawing it from your main amplifier. Alongside its continuous RMS rating, a separate 1,000-watt transient rating addresses short-duration output for sudden musical impact. These are distinct power ratings, not interchangeable figures. This US configuration requires a 110-120-volt mains supply.

12 in CarbonAlloy Active Driver

A pure carbon-fiber center cap replaces the earlier solid aluminum design, reducing moving mass while increasing cone stiffness. The long-throw cone and die cast alloy chassis form the front-firing active assembly. Together, these engineering choices reflect the design's emphasis on transient response and the quiet-passage detail that matters as much as dramatic bass passages.

Down-Firing Passive Radiator

Beneath the cabinet, a flat-cone 12 in passive radiator complements the active driver. Its carbon, glass-fiber and closed-cell foam construction combines reduced weight with greater stiffness, while travel exceeding 2.4 in in each direction supports low-frequency output. A steel chassis supports the radiator assembly.

High Level and .1/LFE for Music and Movies

Connect High Level to your main amplifier's speaker outputs through the supplied Neutrik Speakon cable to carry the system's signal character, not its operating power. Keeping that connection alongside the dedicated .1/LFE path lets a combined stereo and theater system retain both signal routes. Two Low Level RCA inputs, an LFE RCA input and an LFE XLR input offer connection choices, while thin-film capacitors handle analog input filtering.

Expandable Stereo Pairs and Line Arrays

Build beyond a single subwoofer with stereo-pair configurations or line arrays of up to three subwoofers per channel.¹ Recessed stainless steel handles are anchored by internal aluminum slabs for array stacking. Integrated knurled aluminum leveling controls help accommodate uneven or soft floors, and a line-array mounting hardware kit is included.

Optional Airship Direct Wireless

When signal-cable routing would complicate placement, the compatible Airship Direct system can transmit High Level and .1/LFE signals at the same time.² This is an optional wireless upgrade, not built-in wireless connectivity. The subwoofer still requires its AC power connection.

Piano Black Lacquer and Grille Choices

The gloss-black exterior pairs elliptical cabinet details with recessed stainless steel handles and warm silver-gold badges with a titanium-like appearance. The supplied cloth grille provides the standard front treatment, while a Premium Wood Grille offers an alternative look.³

Features

• 850 Watts RMS, 1,000-Watt Transient Output
  Pairs continuous amplifier power with a separate short-duration output rating.
• 12 in CarbonAlloy Active Driver
  Combines a long-throw cone with a lightweight pure carbon-fiber center cap.
• Down-Firing 12 in Passive Radiator
  Adds a lightweight, stiff flat-cone assembly to support bass output.
• 19 Hz In-Room Extension (-6 dB)
  Documents low-frequency reach with both the response tolerance and room condition stated.
• Simultaneous High Level and .1/LFE
  Keeps stereo and home-theater signal connections available together.
• RCA and XLR LFE Connections
  Provides two Low Level RCA inputs plus dedicated RCA and XLR LFE inputs.
• Thin-Film Capacitor Analog Filtering
  Keeps incoming signal filtering in the analog domain.
• Stereo-Pair and Line-Array Capability
  Supports expansion up to three units per channel, with integrated leveling controls.¹
• Airship Direct Ready
  Offers a wireless signal upgrade through a separately purchased system.²
• Piano Black Lacquer and Grille Options
  Includes a cloth grille, with a Premium Wood Grille available separately.³
• Electronic Protection
  Provides fully electronic Set Safe, D.C. fault and output-short safeguards.
• Included Setup Accessories
  Supplies a mains lead, nominal 10-meter Neutrik Speakon cable and array mounting hardware.

Footnotes:

¹ Stereo pairs and line arrays require additional subwoofers purchased separately. This configuration includes one subwoofer.

² Airship Direct is optional and sold separately; a wireless transmitter and receiver are not included.

³ The Premium Wood Grille is sold separately and is not included. Natural wood grain and color vary.